Thermal analysis of slurry ice production system using direct contact heat transfer of carbon dioxide and water mixture

Thongwik, Sathaporn; Vorayos, Nat; Kiatsiriroat, Tanongkiat; Nuntaphan, Atipoang

doi:10.1016/j.icheatmasstransfer.2008.02.007

Cited by 41 publications

(14 citation statements)

References 4 publications

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“…In addition, the direct contact process achieves a high level of mixing which can enhance the phase change cycling stability of the PCM [11]. Thongwik et al [12] experimentally investigated using carbon dioxide gas as the heat transfer fluid, with water as the PCM. Excellent heat transfer was found as presented by near unity heat exchange effectiveness over the entire phase change process.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

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Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

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“…Amongst the existing ice slurry generation mechanisms [2,[6][7][8][9][10][11][12][13][14], scraped surface is the most widely utilised. With a type of freezing point depressant (FPD) added in water, ice would nucleate and propagate on a cold metal surface before it can further develop into a mushy layer.…”

Section: Introductionmentioning

confidence: 99%

“…Whether the quality of the ice slurries would affect electromagnetic wave attenuation which can be used as the fundamental principle of an online ice fraction detection method [23] is not well understood yet. Another method considered inexpensive is to produce ice slurries or flake ice by means of direct contact which requires neither subcooled surfaces nor mechanisms to maintain the rate of production [10][11][12][13][14]. However, this way of ice production requires the mixing of water, refrigerant and compressor oil, making it suitable for the thermal storage application but cannot be implemented in the food industry.…”

Section: Introductionmentioning

confidence: 99%

Ice formation in the subcooled brine environment

Yun¹,

Brooks²,

Cheng

et al. 2016

International Journal of Heat and Mass Transfer

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Generating ice in a fluid immiscible with water is relatively easy but considerably more difficult if the chosen fluid is hydrophilic. Our experimental work showed that, ice can be produced when water is introduced to a bath of subcooled brine and it was believed that, the rate of heat transfer between the two fluids needs to be higher than that of mass transfer to allow the formation of ice to occur as a result. Flow rheology, hence the size of the active surface area of the injected water stream, brine temperature and concentration are the key factors influencing how much ice can be made in the process. Conversion ratios of two ice collection methods are compared over a range of brine temperatures and concentrations. The washing method (wet collection) was found to collect up to 27% more ice than dry collection. Washing is also very effective in rinsing off the brine and salt on the ice's surface and the bulk salinity would drop from 13% to 1%. Since the evaporator temperature has to be higher than the eutectic point of brine, it was suggested that, the coefficient of performance, COP, will be very promising. In addition, this way of ice production should achieve higher efficiency than a scraped surface ice maker and it is simpler in that it requires no complex mechanical harvesting equipment, and with the vast liquid-liquid surface areas possible, promises to be able to produce high quantities of ice per unit volume of equipment.

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“…However, in this system, some problems still exist, such as the large refrigerant consumption, the difficulty in separating the refrigerant from the water, and the ice blockage in the nozzle. To overcome the above weaknesses, Thongwik et al (2008) used carbon dioxide as the dispersed phase, instead of the two-phase refrigerant. In their study, carbon dioxide was cooled and then injected into the water solution to make ice slurry.…”

Section: Introductionmentioning

confidence: 99%

“…Although much research has been carried out on direct contact heat transfer, work on the heat transfer process between cold gas and a water solution involving phase transition and ice slurry generation in the continuous phase, was only found in (Thongwik et al, 2008). Zhang et al (2008;2010a;2010b) and Zheng et al (2010) studied the effects of the mass flow rate, the nozzle diameter, and the gas inlet velocity on the volumetric heat transfer coefficient (U v ), and found that the addition of ethylene glycol (EG) could prevent the ice blockage in the nozzle effectively.…”

Section: Introductionmentioning

confidence: 99%

Analysis of ice slurry production by direct contact heat transfer of air and water solution

Zhang

Zheng

Wang

et al. 2013

J. Zhejiang Univ. Sci. A

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Abstract:In this paper, a novel system using direct contact heat transfer between air and water solution was proposed to generate ice slurry. The heat transfer process and the system performance were studied; energy efficiency coefficients of 0.038, 0.053, and 0.064 were obtained using different solutions. An empirical relationship between the volumetric heat transfer coefficient U v and the main parameters was obtained by fitting the experimental data. The U v calculated from the empirical formula agreed with the experimental U v quite well with a relative error of less than 15%. Based on the empirical formula, a laboratory-scale direct contact ice slurry generator was then constructed, with practical application in mind. If the air flow rate is fixed at 200 m 3 /h, the ice production rate will be 0.091 kg/min. The experimental results also showed that the cold energy consumption of the air compressor accounted for more than half of the total amount. To improve the system energy efficiency coefficient, it is necessary to increase the air pipes insulation and the solution's thermal capacity, and also it is appropriate to utilize the free cold energy of liquefied natural gas (LNG).

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Thermal analysis of slurry ice production system using direct contact heat transfer of carbon dioxide and water mixture

Cited by 41 publications

References 4 publications

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Ice formation in the subcooled brine environment

Analysis of ice slurry production by direct contact heat transfer of air and water solution

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